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Study on structure homogeneity of plate sample with large dimension during equal channel angular pressing (ECAP)

Published online by Cambridge University Press:  20 October 2016

Jinfang Dong ,
Qing Dong ,
Yongbing Dai ,
Hui Xing ,
Yanfeng Han ,
Jianbo Ma ,
Jiao Zhang ,
Jun Wang  and
Baode Sun
Jinfang Dong
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Qing Dong
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Yongbing Dai
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Hui Xing*
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Yanfeng Han
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Jianbo Ma
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Jiao Zhang*
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Jun Wang
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Baode Sun
Affiliation:
Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
*
a) Address all correspondence to these authors. e-mail: xinghui@sjtu.edu.cn
b) e-mail: zj119@sjtu.edu.cn
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Abstract

A self-made die with large cross section (180.2 × 22.2 mm) for equal channel angular pressing (ECAP) was used to study the influence of two different pressing routes (C X and C Y ) on refining homogeneity of high-purity aluminum plates. Microstructures were investigated by optical microscopy (OM) and electron back scatter diffraction (EBSD) methods, and micro-hardness and tensile tests were taken to evaluate deformation degree across the cross section and mechanical properties, respectively. The results indicate that pressing routes of ECAP have a great influence on structure homogeneity of plate samples. The route C Y leads to fine grains with better homogeneity because the same deformation direction is taken through each pass. Coarse columnar crystals with 3–4 mm change to 68.6 μm nearly equiaxed grains and a strong cube texture forms after four C Y passes, and corresponding mechanical properties increase by a factor compared to as-cast plate.

Keywords

equal-channel angular pressinghigh-purity aluminumstructuregrainhomogeneity
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3420 - 3427
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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